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Critical 0 day vulnerability affected 300k+ sites about a month ago, including mine. Admin url redirected to spam sites, but could have been much much much worse as it was exploited to gain complete admin control of many sites. Reviewing after finally deleting this plugin. Do not use, just use "WP Mail SMTP" plugin instead.
Google "easy wp smtp plugin vulnerability" to see how severe this was. Still took them 2 days to release a patch after being notified! Not worth the risk, do not install!

A good plugin for Changing WordPress Smtp settings. I have used this on 2 websites. from the first one website, when sending email it shows mail signed by mydomain.tld, but in second one it not showing any signed by. why ?

Occasionally, we run into a host or mailserver that can't deal with the WordPress or PHP mail() function.
The problem seems to be that if your mail is managed on a different server/host than the website, then the spam protection on the mailserver regards any mail from website as evil, rejecting it even before you can whitelist it. (Even trying to trick it with a different "replyto" or using the wordpress@mydomain.com within ContactForm7 doesn't work.)
The fix is to use a plugin to replace the mail() function so that instead of the website's server sending the mail, you are actually logging in via SMTP to the mailserver, sending mail from there instead.
Then the mailserver's spam checker is happy.
It can be tricky to configure this, since there are various settings for TTS or SSL or the port or whatnot, so budget a little time for that.